1. Ch 10 Chemical Reactions 10.1

2. Evidence of Chemical Change Temperature change 100.1 http://gallery.hd.org/_c/natural-science/_more1999/_more05/ice-melts-at-0C-electronic-thermometer-glass-beaker-liquid- water-ice-cubes-melting-probe-in-water-white-backdrop-2- AJHD.jpg.html?sessionVar=spider&sessionVarLiteUI=true&sessionVarLocale=en_GB

3. Evidence of Chemical Change COLOR CHANGE

4. http://pubs.acs.org/cen/newscripts/86/8626newscripts.ht ml ODOR

5. Evidence of Chemical Change Gas Bubbles

6. http://year9reaction.wordpress.com/precipitation/ http://www.chem.uiuc.edu/webFunChem/gra mmoleprob/GramMoleProb3.htm A solid forms Precipitate

8. Chemical Equations Word Equation Solid sodium reacts with water to produce sodium hydroxide and hydrogen gas Skeletal Na+H 2 O NaOH + H 2

9. Balanced Chemical Equations

10. Balanced Chemical Equations Skeletal Na+H 2 O NaOH + H 2 Balanced 2Na+2H 2 O 2NaOH + H 2

11. Balancing Chemical Equations 1. Write Skeletal Equation  Be sure to use proper formulas 2. Count atoms of each element in reactants  Remember diatomics H 2, O 2, N 2, F 2, Br 2, Cl 2, I 2 3. Count atoms of each element in products 4. Change coefficients to balance the number of each element in reactants and products 5. Make sure coefficients are in lowest possible ratio Flow chart on pg 283